Stem machine chuck



s Sheets-Shet 1 Jan. 9, 1945. c. HERZOG STEM MACHINE CHUCK Filed April 8, 1943 Jan. 9, 1945. c, HERZOG STEM MACHINE CHUCK 5 Sheets-Sheet 2 Filed April 8, 1945 Wag Jan. 9, 1945. c. HERZOG STEM MACHINE CHUCK Filed April a, 1943 3 Sheets-Sheet 5 Patented Jan. 9, 1945 UNITED STATES PATENT OFFICE amass I STEM momma cnuox Carl Her-log, Bellevllle, N. J. 3 Application April 8, 1943, Serial No. 482,307

16 Claims.

My invention relates to stem machines and has particular reference to a chuck for use in connection therewith.

An important object at the invention is to provide a chuck oi the above mentioned character, all operations of which are eflected by the movements of a single pinch member.

' A further object of the invention is to provide a chuck of the above mentioned character which is simple in construction, formed of few parts, chea to manufacture, and simple and reliable in operation.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings forming a part of this application and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a plan view of a stem machine chuck embodying my invention,

Figure 2 is a vertical section taken on line line enlarged scale, through the sleeve, associated 7 elements in levation and parts broken away. Figure 4 is a view similar to Figure 2, showing the sleeve in the uppermost position and the pinching member raised and having pinching engagement with the wires,

Figure 5 is an enlarged fragmentary side elevation of the pinching member or head and wire.

Figur 6 is a view similar to Figure 2, but showing the sleeve and pinching member having pinching engagement with the wires, andthe sleeve in the lowermost position,

Figure '7 is a view similar to Figure 2, showing the sleeve and pinching member shifted. to the uppermost position, to release the wires.

In the drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral I0 designates a stationary end or head, having a central cylindrical opening II and an upstanding boss l2, engaging within a recess it formed in a preterably cylindricalhousing l4, and rigidly held therein by set screw or screws W or any other suitable means. This housing is stationary and preferably vertically arranged and is provided at its top with a cylindrical recess 15, for receiving a forming block l6, rigidly held in. place by screws H or othersuitable means. This forming block has an annular set of vertical openings or apertures II to receive wires It,

to guide the sam and hold them suitably spaced. Recesses 20 are arranged at the top of the openings id to form beads. The forming block it has the usual press block (not shown) mounted to reciprocate above it, and these two blocks constitute a mold which produces a stem for electron discharge devices or the like. This. stem includes a glass disk, 9. glass tube welded to the glass disk and lead wires passing through and embedded in the glass disk and forming a gastight joint with the disk. These stems may be used with electron discharge devices having a metal envelope or a glass envelope. Such stems ar illustrated in the patents to A. J. Franke, 2,195,483 and G. M. Rose, 2,030,186. These patents also show molds including a lower forming block and an upper reciprocatory press block.

Substantially the same molds shown in these patents may be used or any other suitable form of mold. Th housing 14 has a main cylindrical bore 2| and a reduced upper bore 22, providing a horizontal shoulder 23. The bore 22 constitutes a space.

Arranged within the bore 2| is a reciprocatory preferably cylindrical sleeve 24, disposed between th top of the boss I 2 and the shoulder 23, to engage therewith at the end of its travel in opposite directions. Ther is a clearance 24', when the sleeve 24 is in the lowermost and uppermost positions. This sleeve is concentric with the upper bore 22, and the bore of the sleeve is preferably slightly rounded or flared upwardly, at its top, as shown at 24, to guide the wire into th bore of the sleeve. The sleeve is provided near and spaced from its top with an annular recess 25, having a depth of radial dimension throughout its entire length less than the diameter of the wires. Arranged between the top of the sleeve 24 and the recess 25 is an annular jaw 26, formed by the inner face of the sleeve 24. The sleeve 24 has a vertically inclined annular shoulder 26' at the bottom of the jaw 26..

The numeral 21 designates pinching means as a whole, including a vertical rod or plunger 28, slidably mounted in the opening I l to reciprocate therein. This rod also extends into the sleeve 24 and is slidable therein. Preferably formed integral with the top of the rod 28 is a pinching member or head 29 having an upper frustroconical portion 30, increasing in diameter downwardly, and a lower frustro-conical portion 3|, decreasing in diameter downwardly. These frustro-conical portions provide an annular sharp or knife edge 32. As more clearly shown in Figure 3, the rod 28 extends radially beyond the annular knife edge 32, forming a horizontal shoulder 32' for the pinching member to engage the lower nds of the wires l9.

The rod or plunger 28 may be raised or lowered by a single cam, during its operation.

The operation of the apparatus isas follows:

The several elements are in the loading position in Figure 2. The sleeve 24 is in the lowermost position and the pinching member '21 is in the lowermost position and the head 29 is arranged adjacent to the lower portion of the recess 25 and spaced downwardly from the jaw 26. The lead wires l9 are now inserted downwardly through the openings l8 and enter the upper end of the sleeve 24, and their lower ends engage the upper frustro-conical face 30 and are guided outwardly thereby into the annular recess 25 so that their lower ends come to rest upon the horizontal shoulder 32' of the rod 28.

With the wires and parts thus arranged, the rod 28 is moved upwardly and carries the wires resting upon the shoulder 32' upwardly with it. The rod 28 first moves upwardly with relation to the sleeve 24 without raising the sleeve but when the sharp edge 32 of the head 29 reaches the inclined shoulder 26' there is a binding action between the head, wires and sleeve, so that the sleeve is now shifted upwardly with the rod. When the sleeve moves upwardly and engages the shoulder 23 the upward movement of the sleeve is stopped, while the rod 28 continues to move upwardly until the knife edge 32 is in the center of the jaw 26, Figure 4. During this movement, the knife edge 32 embeds itself in the wires, for a suitable distance, such as for .002" (two thousandths of an inch) Figure 5. This is accomplished by virtue of the dimensions of the jaw 26 and the knife edge 32. For example, if the outside diameter of the head 29 at the knife edge 32 is 1.00" (one inch) and the inside diameter of the jaw 26 i 1.046 (one and forty-six thousandths inches) and the wires are .025" (twentyfive thousandths of an inch) in diameter, then the knife edge will be forced .002" (two thousandths of an inch) into the wire. The wire diameter differences up to .0015" (fifteen ten thousandths of an inch) which is much more than the commercial tolerance does not affect the proper functioning. The knife edge 32 is embedded within the wires as this knife edge passes over the inclined shoulder 26 and the lower ends of the wires being supported upon the shoulder 32', which shoulder is fixed with relation to the knife edge, causes the wires to slide along the cylindrical face of the jaw 26, while the knife edge is being or has been embedded therein. The wires are now pinched or clamped between the head 29 and the jaw 26. By moving the rod 28, this rod, sleeve 24 and wires 19 may now be moved as a unit, from the uppermost position shown in Figure 4 to the lowermost position shown in Figure 6, and to the various intermediate positions. The wires are therefore securely held by the chuck and may be vertically moved or adjusted, within the limits of the clearance 24'.

For releasing or unloading the wires, the rod 28 is moved to the uppermost position, and this brings the sleeve 24 into contact with the shoulder 23, and the rod continues in its upward movement until its head 29 passes above the jaw 26 and enters the upper bore 22, Figure 7. The shoulder 32 causes the wires i9 to slide upwardly upon the face of the jaw 26 until the wires clear the jaw. The wires are now free to be moved from the knif edge 32, and the angle of this knife edge being 45, such knife edge does not lock the wires to it, and the wires can be readily removed.

It is thus seen that all operations are accomaaeenso plished by the manipulation of the single pinching member 21. These operations include loading, clamping, moving and unloading, and all are effected by moving the pinching member 21, The pinching member may be operated by a single cam operating upon the rod 28.

The molding of the glass disk about the lead wires I9 is effected in the usual manner, such as described in Patents 2,195,483 and 2,030,186.

It is to be understood that the form of my invention herein shown and described is to be taken as a preferred example of the same and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of my invention or the scope of the subjoined claims.

Having thus described my invention, what I claim is:

1. In a stem machine chuck, a jaw having a substantially cylindrical opening to receive wires, a pinching member provided with substantially a knife edge, said knife edge having a smaller diameter than the substantially cylindrical opening and movable into such opening, the knife edge having a clearance with the jaw when the knife edge is in said opening of less than the diameter of the wires, said knife edge when within said opening serving to press the wires against the jaw and to become embedded within the wires.

2. In a stem machine chuck, a jaw having a substantially cylindrical opening to receive wires, a pinching member provided with a reduced edge, said reduced edge having a smaller diameter than the substantially cylindrical opening and movable into one end of th opening and out of the opposite end of the opening, the reduced edge having a clearance with the jaw when the reduced edge is in said opening of less than the diameter of the ires said reduced edge when within said ning serving to press the wires against the Jaw and to become embedded within the wires, and means to effect a relative move ment between the pinching member and the jaw.

3. In a stem machine chuck, a movable sleeve having a jaw for engaging wires, a mold element arranged in cooperative relation with the sleeve and having openings to receive the wires and guide them toward the jaw, a pinching member mounted within the sleeve and movable with relation thereto, said pinching member having a knife edge to press the wires against the jaw and to become embedded within the wires, and means to hold the sleeve against movement in one direction while the pinching member is moving in that direction.

4. In a stem machine chuck, a movable element having a jaw provided with an opening for receiving wires, a mold element arranged in cooperative relation with the movable element and having openings to receive the wires and guide them toward the jaw, a pinching member movable into the opening of the jaw and having a clearance with the jaw less than the diameter of the wires, said pinching member having a knife edge to press the wires against the jaw and to become embedded within the wires, means to move the wires with the pinching member when it is moved toward the jaw, and means to hold the movable element against movement in one direction when the pinching member is moved in that direction.

5. In a stem machine chuck, a. movable element having a jaw provided with an opening to receive wires, a pinching member associated with the movable element and movable with relation thereto, said pinching member having a knife edge movable into the opening of the jaw and having a clearance with the jaw less than the diameter of thewires, the knife edge serving to press the wires against the jaw and to become embedded within the wires, and means to effect a relative movement between the pinching member and the movable element.

6. In a stem machine chuck, a sleeve provided with a jaw having an opening for receiving wires, said sleeve having an internal recess adjacent to the jaw, a pinching member mounted within the sleeve and movable with relation thereto, said pinching member having a knife edge for movement into the jaw and having a clearance with the jaw less than the diameter of the wires, said knife edge serving to press the wires against the jaw and to become embedded within the wires, said pinching member having a part to engage the ends of the wires to move them longitudinally, and means to effect a relative movement between the pinching member and the sleeve.

7. In a stem machine chuck, a sleeve provided with a jaw having an opening to receive wires, said sleeve having an internal recess and a shoulder adjacent to the jaw, a pinching member mounted within the sleeve and movable with relation thereto, said pinching member having a, knife edge for movement into the opening of the jaw and having a clearance with the jaw less than the diameter of the wires, said knife edge serving to press the wires against the jaw and to become embedded within the wires, said pinching member having a shoulder to engage the ends of the wires, mean to effect a relative movement between the pinching member and sleeve.

.8. In a stem machine chuck, a support, a mold element mounted upon the support and having openings to receive wires, a sleeve arranged upon one side of the mold element and having a substantially annular wire engaging jaw, said sleeve having a substantially annular internal recess and an inclined shoulder arranged adjacent to the jaw, a pinching member mounted within the sleeve and movable with relation thereto and having a substantially circular knife edge for movement into the annular jaw, said knife edge having a clearance with the annular jaw less than the diameter of the wires, said knife edge serving to'press the wires against the jaw and to become embedded within the wires, said pinching member having a shoulder to engage the ends of the wires, and means to effect a relative movement between the pinching member and the sleeve.

9. In a stem machine, a housing-having a stop,

a sleeve mounted within the housing and movable toward the stop, said sleeve having a jaw provided with an opening which has substantially the same cross sectional area throughout its length to receive wires, and a pinching member mounted within the sleeve and movable with relation thereto, said pinching member having a reduced edge to enter the opening of the jaw and press the wires against the jaw and to become embedded within the wires, the reduced edge having a clearance with the jaw when the reduced edge is in the opening of the jaw of less than the diameter of the wires.

10. In a stem machine chuck, a. housing having a stop and a space outwardly of the stop, a

the pinching member being movable to shift the knife edge from the opposite end of said opening into the space to release the wire when the sleeve engages the stop.

11. In a stem machine chuck, a. support having a stop and a space above the stop, a forming block mounted upon the support adjacent to the space and having openings to receive wires, a sleeve associated with the support and arranged beneath the forming block and movable toward the stop, said sleeve having a substantially annular jaw and an internal recess adjacent to the jaw, a pinching member mounted within the sleeve and movable with relation thereto, said pinching member having a head provided with a substantially annular knife edge and a shoulder disposed beneath the knife edge, the shoulder serving to engage the ends of the wires and the knife edge serving to press the wires against the jaw-and become embedded therein, the pinching member being movable to shift the head up-- wardly beyond the jaw into the space.

12. In a stem machine chuck, a support, a forming block mounted upon the support and having openings to receive wires, a sleeve associated wtih the support and arranged beneath the forming block, said sleeve having a jaw provided with a bore and an internal recess adjacent to the jaw, a pinching member mounted within the sleeve and movable with relation thereto, said pinching member having a knife edge and an inclined face above the knife edge and a .shoulder beneath the knife edge, the pinching member being movable to shift the knife edge above the jaw.

, 13. In a stem machine chuck, a sleeve having a tubular jaw and an internal recess adjacent to the jaw, and a pinching member mounted within the sleeve and movable with relation thereto, said pinching member havingia. knifeedg and a shoulder.

14. In a stem machine chuck, a sleeve having a tubular jawand an internal recess adjacent to a the jaw, and a pinching member mounted within the sleeve and movable with relation thereto, said pinching member having a knife edge and an inclined face upon one side of the knife edge and a shoulder upon the oppoiste side of the knife edge. 7

15. In a stem machine chuclqa sleeve having a tubular jaw and an internal recess adjacent to the jaw, and a pinching member mounted within the sleeve and movable with relation thereto, said sleeve mounted within the housing and movable I pinching member having a head, said head having inclined faces which converge for providing a knife edge, said pinching member having a shoulder upon one side of the knife edge.

16. In a stem machine chuck, a sleeve having a tubular jaw and an internal recess adjacent to the jaw, and a pinching member mounted with in the sleeve and movable with relation thereto,

said pinching member having faces disposed at substantially with relation to each other and converging to form a knife edge, said pinching member having a shoulder upon one side of the knife edge, V

GARL. HERZOG. 

